I think it is a very interesting scientific topic here. Even though the technology we have in the area is yet to be fully tested and developed, it is already a pretty hot topic to discuss – resurrection of the extinct species.
I personally do not think it is a good idea to resurrect the extinct species. The extinct species are gone for reasons. Even when human is often the cause of most of the recent extinctions, the environment is constantly adapting and changing into a world that has no place for these extinct species. Especially for those species that have been gone for thousands of years, simple things as adapting the current climate (a rapidly changing one; even the living can not withstand) is the first obstacle that the parents (scientists) need to work on; then they may create new species with genetic engineering (another story).
Just an interesting science topic.